Became suitable sites for new civilizations like mesopotamia because they provided arable land and sources for irrigation. a. coastal plains b. mountainous regions c. tropical forests d. river valleys

D. It's because river valleys provided the Mesopotamians a better way to get irrigation and water supplies. In fact, it made their means of getting those way easy so then they will be able to fully grow crops without any worry thanks to the natural supply near their area.

Place the point of the compass on point b and draw an arc that intersects  be¯¯¯¯¯  , using    ab    as the width for the opening of the compass.  hope it

The answer is d if you are on edgenuity.